<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
		<style>
			.container {
				background-color: #eeeeee;
				padding: 60px;
			}

			.btn-primary {
				background-color: #337ab7;
				width: 130px;
				height: 40px;
				color: #f3eded;
				border-radius: 4px;
				border: none;
			}
			h1 {
				margin-top: 0px;
			}
		</style>
	</head>
	<body>
		<!-- 
			NOTICE: "程序" 就是 做事情的 "过程" 和 "顺序"。
            1. 分析和设计出标签的结构：div > h2 + p + button
            2. set the background-color of div
			3. let content area leave border away
			4. beauty the button
				4.1 set background-color
				4.2 set size
				4.3 set the color of text
				4.4 set border
         -->
		<div class="container">
			<h1>Hello World</h1>
			<p>
				Lorem ipsum dolor sit amet consectetur adipisicing elit. Vel nobis
				voluptatem aut in excepturi dolores vitae accusantium! Sunt, tempore
				maiores accusamus dolores minus id magnam incidunt impedit voluptatibus,
				numquam expedita.
			</p>
			<button class="btn-primary">Learn more</button>
		</div>
	</body>
</html>
